Pictures/Frames
While the terms "frame" and "picture" are often used interchangeably, strictly speaking, the term picture is a more general notion, as a picture can be either a frame or a field. A frame is a complete image captured during a known time interval, and a field is the set of odd-numbered or even-numbered scanning lines composing a partial image. When video is sent in interlaced-scan format, each frame is sent as the field of odd-numbered lines followed by the field of even-numbered lines.
Frames that are used as a reference for predicting other frames are referred to as reference frames.
In such designs, the frames that are coded without prediction from other frames are called the I-frames, frames that use prediction from a single reference frame (or a single frame for prediction of each region) are called P-frames, and frames that use a prediction signal that is formed as a (possibly weighted) average of two reference frames are called B-frames.
Read more about this topic: Video Compression Picture Types
Famous quotes containing the words pictures and/or frames:
“Museums are just a lot of lies, and the people who make art their business are mostly imposters.... We have infected the pictures in museums with all our stupidities, all our mistakes, all our poverty of spirit. We have turned them into petty and ridiculous things.”
—Pablo Picasso (1881–1973)
“In frames as large as rooms that face all ways
And block the ends of streets with giant loaves,
Screen graves with custard, cover slums with praise
Of motor-oil and cuts of salmon, shine
Perpetually these sharply-pictured groves
Of how life should be.”
—Philip Larkin (1922–1986)